A system for controlling a turbine valve is provided. The system includes a hydraulic pilot valve section being moveable in a first direction and a second direction; a main hydraulic valve section being moveable in a first direction to close the turbine valve and a second direction to open the turbine valve; a position demand indicating a desired position of the turbine valve; a first feedback indicating an actual position of the hydraulic pilot valve section; and aa second feedback indicating an actual position of the main hydraulic valve section. The system also includes a pilot valve error; a main valve error; a turbine valve error; and a pilot valve adjustment moving the hydraulic pilot valve section in response to the turbine valve error. The turbine valve error is repeatedly determined and the pilot valve adjustment repeatedly moves the hydraulic pilot valve section to minimize the turbine valve error.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The system for controlling the turbine valve of claim 1, wherein the turbine valve is a steam valve.
3. The system for controlling the turbine valve of claim 1, further comprising a weight gain applied to the pilot valve error or the main valve error.
4. The system for controlling the turbine valve of claim 3, wherein the weight gain applies a greater weight to the pilot valve error.
5. The system for controlling the turbine valve of claim 4, wherein the weight gain is applied to the pilot valve error based on a value of a weight gain parameter.
6. The system for controlling the turbine valve of claim 1, wherein the turbine valve error further incorporates a proportional gain and an integral factor.
7. The system for controlling the turbine valve of claim 1, wherein the turbine valve error is used to produce a current output for controlling the pilot valve adjustment.
8. The system for controlling the turbine valve of claim 7, wherein the current output for controlling the pilot valve adjustment comprises a first current output value based on a proportional gain.
9. The system for controlling the turbine valve of claim 8, wherein the first current output value is cleared in response to a request for a directionally opposite pilot valve adjustment.
10. The system for controlling the turbine valve of claim 1, wherein the pilot valve error, the main valve error, and the turbine valve error are determined by a same module.
12. The method for controlling the turbine valve of claim 11, wherein the turbine valve is a steam valve.
14. The method for controlling the turbine valve of claim 13, wherein the weight gain applies a greater weight to the pilot valve error.
16. The method for controlling the turbine valve of claim 11, wherein determining the turbine valve error is further based on a proportional gain and an integral factor.
20. The method for controlling the turbine valve of claim 11, wherein determining the pilot valve error, the main valve error, and the turbine valve error is performed by a same module.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
October 26, 2023
November 12, 2024
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